 /*******************************************************************************
  * Copyright (c) 2000, 2006 IBM Corporation and others.
  * All rights reserved. This program and the accompanying materials
  * are made available under the terms of the Eclipse Public License v1.0
  * which accompanies this distribution, and is available at
  * http://www.eclipse.org/legal/epl-v10.html
  *
  * Contributors:
  * IBM Corporation - initial API and implementation
  *******************************************************************************/

 package org.eclipse.ui.views.bookmarkexplorer;

 import org.eclipse.core.resources.IMarker;
 import org.eclipse.core.runtime.CoreException;
 import org.eclipse.jface.dialogs.IDialogSettings;
 import org.eclipse.jface.viewers.Viewer;
 import org.eclipse.jface.viewers.ViewerComparator;

 class BookmarkSorter extends ViewerComparator {

     private int[] directions;

     private int[] priorities;

     final static int ASCENDING = 1;

     final static int DESCENDING = -1;

     final static int DESCRIPTION = 0;

     final static int RESOURCE = 1;

     final static int FOLDER = 2;

     final static int LOCATION = 3;

     final static int CREATION_TIME = 4;

     final static int[] DEFAULT_PRIORITIES = { FOLDER, RESOURCE, LOCATION,
             DESCRIPTION, CREATION_TIME };

     final static int[] DEFAULT_DIRECTIONS = { ASCENDING, //description
 ASCENDING, //resource
 ASCENDING, //folder
 ASCENDING, //location
 ASCENDING, }; //creation time

     public BookmarkSorter() {
         resetState();
     }

     public void reverseTopPriority() {
         directions[priorities[0]] *= -1;
     }

     public void setTopPriority(int priority) {
         if (priority < 0 || priority >= priorities.length) {
             return;
         }

         int index = -1;
         for (int i = 0; i < priorities.length; i++) {
             if (priorities[i] == priority) {
                 index = i;
             }
         }

         if (index == -1) {
             resetState();
             return;
         }

         //shift the array
 for (int i = index; i > 0; i--) {
             priorities[i] = priorities[i - 1];
         }
         priorities[0] = priority;
         directions[priority] = DEFAULT_DIRECTIONS[priority];
     }

     public void setTopPriorityDirection(int direction) {
         if (direction == ASCENDING || direction == DESCENDING) {
             directions[priorities[0]] = direction;
         }
     }

     public int getTopPriorityDirection() {
         return directions[priorities[0]];
     }

     public int getTopPriority() {
         return priorities[0];
     }

     public int[] getPriorities() {
         return priorities;
     }

     public void resetState() {
         priorities = new int[DEFAULT_PRIORITIES.length];
         System.arraycopy(DEFAULT_PRIORITIES, 0, priorities, 0,
                 priorities.length);
         directions = new int[DEFAULT_DIRECTIONS.length];
         System.arraycopy(DEFAULT_DIRECTIONS, 0, directions, 0,
                 directions.length);
     }

     private int compare(IMarker marker1, IMarker marker2, int depth) {
         if (depth >= priorities.length) {
             return 0;
         }

         int column = priorities[depth];
         switch (column) {
         case DESCRIPTION: {
             String desc1 = marker1.getAttribute(IMarker.MESSAGE, "");//$NON-NLS-1$
 String desc2 = marker2.getAttribute(IMarker.MESSAGE, "");//$NON-NLS-1$
 int result = getComparator().compare(desc1, desc2);
             if (result == 0) {
                 return compare(marker1, marker2, depth + 1);
             }
             return result * directions[column];
         }
         case RESOURCE: {
             String res1 = marker1.getResource().getName();
             String res2 = marker2.getResource().getName();
             int result = getComparator().compare(res1, res2);
             if (result == 0) {
                 return compare(marker1, marker2, depth + 1);
             }
             return result * directions[column];
         }
         case FOLDER: {
             String folder1 = BookmarkLabelProvider.getContainerName(marker1);
             String folder2 = BookmarkLabelProvider.getContainerName(marker2);
             int result = getComparator().compare(folder1, folder2);
             if (result == 0) {
                 return compare(marker1, marker2, depth + 1);
             }
             return result * directions[column];
         }
         case LOCATION: {
             int line1 = marker1.getAttribute(IMarker.LINE_NUMBER, -1);
             int line2 = marker2.getAttribute(IMarker.LINE_NUMBER, -1);
             int result = line1 - line2;
             if (result == 0) {
                 return compare(marker1, marker2, depth + 1);
             }
             return result * directions[column];
         }
         case CREATION_TIME: {
             long result;
             try {
                 result = marker1.getCreationTime() - marker2.getCreationTime();
             } catch (CoreException e) {
                 result = 0;
             }
             if (result == 0) {
                 return compare(marker1, marker2, depth + 1);
             }
             return ((int) result) * directions[column];
         }
         }

         return 0;
     }

     public int compare(Viewer viewer, Object e1, Object e2) {
         IMarker marker1 = (IMarker) e1;
         IMarker marker2 = (IMarker) e2;

         return compare(marker1, marker2, 0);
     }

     public void saveState(IDialogSettings settings) {
         if (settings == null) {
             return;
         }

         for (int i = 0; i < priorities.length; i++) {
             settings.put("priority" + i, priorities[i]);//$NON-NLS-1$
 settings.put("direction" + i, directions[i]);//$NON-NLS-1$
 }
     }

     public void restoreState(IDialogSettings settings) {
         if (settings == null) {
             return;
         }

         try {
             for (int i = 0; i < priorities.length; i++) {
                 priorities[i] = settings.getInt("priority" + i);//$NON-NLS-1$
 directions[i] = settings.getInt("direction" + i);//$NON-NLS-1$
 }
         } catch (NumberFormatException e) {
             resetState();
         }
     }
 }

